The Sithal War took place between (presumably) 2861 and 2865 in Universe A. [6ACV06] It involved the Sith and the Earthicans. What each side stood for is unknown. It resulted in a victory to the Sith, and became known as the Sith Invasion. This battle caused over 98 million combatants, both Sith and Earthicans, to die.

Hermes: And the winner of the war is... Let me just cross-check my tabulation here... Factoring the corsages for the widows...Bender: Hurry up, you number crunching crumb nuncher. Everybody but me is dying of old age.Hermes: Okay... Ah! The winners, at a net cost of only 12 dollars per life cut tragically short... our Sith Overlords!